"CONSISTS OF FRAME HOLDING PRINTED WIRING BOARD WITH CONNECTOR,ELECTRICAL,RECEPTACLE; 2 CAPACITORS,FIXED,ELECTROLYTIC; 1 CAPACITOR,FIXED,CERAMIC DIELECTRIC; 2 MICROCIRCUITS,DIGITAL; 2 KEYING PINS,ONE ON THE LEFT WITH 90 DEG CUTOUT CENTERED FACING LEFT,THE OTHER D-SHAPED WITH FLAT SIDE FACING UP; PROGRAMMED TO TRUTH TABLE 77A102172"